1969—2009年成县日照时数的变化及其影响因素分析

Sunshines Change Characteristic and Its Causes in Chengxian From 1969 to 2009

利用1969—2009年成县日照等观测资料,分析了成县日照时数的年、季、月变化趋势,并分析了其与云量、雾日数、相对湿度的相关性。结果表明,成县41 a的年日照时数总体呈减少趋势,其倾向率为-63.406 h/10a。总云量、雾日数的增加以及相对湿度增大都会导致日照时数的减少。

Using observed data of sunlight hour in Chengxian during 1969-2009, change tendency characteristic of sunlight has analyzed by year, by season and by month. And the relationships between cloud amount, foggy day, relative humidity and sunlight hour have been analysed. The result indicated that the sunshine hours has reduced in 41 year in Chengxian, its tendency rate was - 63.406 h/10 z. And the total cloud cover and foggy day number increase as well as the relative humidity increases can cause the sunshine hours the reduction.